In a mixing bowl, combine salad dressing and chili powder. Add the carrots, broccoli, cauliflower, green onions, and cheese. Lay tortillas flat, then spoon about 1/2 cup vegetable mixture and 1/4 cup lettuce down the center of each tortilla. Wrap each tortilla around the vegetable mixture by folding one end over, then each of the two sides. One end will remain open.